之前客户端与客户端间的交流是需要通过服务器的转发来进行
现在该方案是：
1.需要一个公共服务器来刷新在线客户端的列表
2.客户端与客户端的数据传递不再需要通过服务器转发
3.客户端与客户端之间建立一个长连接
(使用OC Object-C实现)
构思示意图如下：
构思图.jpeg
- 首先，我们需要写一个简单的公共服务器
1.头文件
#import <Foundation/Foundation.h>
@interface ServerSocket : NSObject
/** 端口 */
@property (nonatomic,assign)uint16_t port;
/** 监听地址 */
@property (nonatomic,copy)NSString *listenURL;
/**
* 单例类方法
*
* @return 单例对象
*/
+(instancetype)shareServerSocket;
/**
* 开始监听
*/
-(void)startAccept;
@end
2.实现文件
#import "ServerSocket.h"
#import "GCDAsyncSocket.h"
@interface ServerSocket () <GCDAsyncSocketDelegate>
/** socket */
@property (nonatomic,strong)GCDAsyncSocket *socket;
** 客户端socket数组 */
@property (nonatomic,strong)NSMutableArray *clientSockets;
@end
@implementation ServerSocket
-(NSMutableArray *)clientSockets{
if (!_clientSockets) {
_clientSockets = [NSMutableArray array];
}
return _clientSockets;
}
+(instancetype)shareServerSocket{
static ServerSocket *serverSocket;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
serverSocket = [[self alloc]init];
});
return serverSocket;
}
-(instancetype)init{
if (self = [super init]) {
_socket = [[GCDAsyncSocket alloc]initWithDelegate:self delegateQueue:dispatch_get_global_queue(0, 0)];
}
return self;
}
-(instancetype)init{
if (self = [super init]) {
_socket = [[GCDAsyncSocket alloc]initWithDelegate:self delegateQueue:dispatch_get_global_queue(0, 0)];
}
return self;
}
-(void)startAccept{
NSError *error = nil;
[self.socket acceptOnInterface:self.listenURL port:self.port error:&error];
if (error) {
NSLog(@"开启监听失败 : %@",error);
}else{
NSLog(@"开启监听成功");
}
}
#pragma mark - GCDAsyncSocketDelegate
-(void)socket:(GCDAsyncSocket *)sock didAcceptNewSocket:(GCDAsyncSocket *)newSocket{
//存放客户端的socket对象。
[self.clientSockets addObject:newSocket];
[newSocket readDataWithTimeout:-1 tag:0];
//向每一个客户端发送给在线客户端列表
[self sendClientList];
}
#pragma mark - GCDAsyncSocketDelegate
-(void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err{
//每当有客户端断开连接的时候，客户端数组移除该socket
[self.clientSockets removeObject:sock];
//向每一个客户端发送给在线客户端列表
[self sendClientList];
}
-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{
[sock readDataWithTimeout:-1 tag:tag];
}
/**
* 向每一个连接的客户端发送所有
*/
-(void)sendClientList{
//把socket对象中的host和post转化成字符串，存放到数组中
NSMutableArray *hostArrM = [NSMutableArray array];
for (GCDAsyncSocket *clientSocket in self.clientSockets) {
NSString *host_port = [NSString stringWithFormat:@"%@:%d",clientSocket.connectedHost,clientSocket.connectedPort];
[hostArrM addObject:host_port];
}
//再把数组发送给每一个连接的客户端
NSData *clientData = [NSKeyedArchiver archivedDataWithRootObject:hostArrM];
for (GCDAsyncSocket *clientSocket in self.clientSockets) {
[clientSocket writeData:clientData withTimeout:-1 tag:0];
}
}
@end
- 由于客户端的代码较多，所以这里只写核心
工程文件.png
- ServerSocket.m 主要是客户端作为同时进行监听的服务，跟公共服务器的代码差不多，不同的是要增加一个协议和代理
@protocol ServerSocketDelegate <NSObject>
-(void)ServerSocket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag;
@end
/** 代理 */
@property (nonatomic,weak)id<ServerSocketDelegate> delegate;
/** 接收到其他客户端发来的信息，要把信息传递给代理，通知外界 */
-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{
[sock readDataWithTimeout:-1 tag:0];
if ([self.delegate respondsToSelector:@selector(ServerSocket:didReadData:withTag:)]) {
[self.delegate ServerSocket:sock didReadData:data withTag:tag];
}
}
- ListenDelegate.m 是用来接收自身客户端连接到其他客户端时候的代理，其实可以用当前的controller做为代理，但为了区分跟公共服务器的代理，所以这里另外新建一个类
#import "ListenDelegate.h"
#import <GCDAsyncSocket.h>
@interface ListenDelegate ()
@end
@implementation ListenDelegate
-(void)socket:(GCDAsyncSocket *)sock didAcceptNewSocket:(GCDAsyncSocket *)newSocket{
}
-(void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port{
NSLog(@"客户端与客户端连接成功");
[sock readDataWithTimeout:-1 tag:0 ];
}
-(void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err{
NSLog(@"客户端与客户端连接失败 error:%@",err);
}
@end
- ViewController.m 主要界面和逻辑的实现 简单实现界面如下:
界面.png
- 主要代码如下:
#pragma mark - GCDAsyncSocketDelegate
-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{
NSArray *clientOnLine = [NSKeyedUnarchiver unarchiveObjectWithData:data];
//根据最新的在线列表来删除自身在线列表字典已经下线的客户端
NSMutableArray *deleteKeys = [self.dataSoures mutableCopy];
[deleteKeys removeObjectsInArray:clientOnLine];
for (NSString * key in deleteKeys) {
[self.mySocketsDict removeObjectForKey:key];
}
//获取最新的客户端在线列表
self.dataSoures = [clientOnLine mutableCopy];
dispatch_sync(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
});
[sock readDataWithTimeout:-1 tag:0];
}
-(void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port{
NSLog(@"连接成功");
//更新选中的socket
self.activeSocket = sock;
dispatch_sync(dispatch_get_main_queue(), ^{
self.connectBtn.enabled = NO;
self.disConnect.enabled = YES;
});
//开启自身的监听
ServerSocket *listenSocket = [ServerSocket shareServerSocket];
listenSocket.port = sock.localPort;
listenSocket.listenURL = ListenHost;
self.listenSocket = listenSocket;
self.listenSocket.delegate = self;
[listenSocket startAccept];
[sock readDataWithTimeout:-1 tag:0];
}
-(void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err{
//断开连接时，清空数据源
[self.dataSoures removeAllObjects];
dispatch_sync(dispatch_get_main_queue(), ^{
self.connectBtn.enabled = YES;
self.disConnect.enabled = NO;
[self.tableView reloadData];
});
}
#pragma mark - UITableViewDataSource
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.dataSoures.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString * cellID = @"cellID";
MyTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if (!cell) {
cell = [[MyTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
}
if (self.dataSoures.count) {
cell.textLabel.text = self.dataSoures[indexPath.row];
}
return cell;
}
#pragma mark - UITableViewDelegate
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
ListenDelegate *ltnDelegate = [[ListenDelegate alloc]init];
self.ltnDelegate = ltnDelegate;
//根据选中的客户端进行长连接
//查看已经保存的其他客户端列表字段中是否已经存在相应的socket
NSString *hostStr = self.dataSoures[indexPath.row];
GCDAsyncSocket *activeSocket = self.mySocketsDict[hostStr];
//如果字典中没有对应的socket,则创建新的socket,并且存进字段
if (!activeSocket) {
activeSocket = [[GCDAsyncSocket alloc]initWithDelegate:ltnDelegate delegateQueue:dispatch_get_global_queue(0, 0)];
self.mySocketsDict[hostStr] = activeSocket;
}
//更新选中的socket
self.activeSocket = activeSocket;
//行进socket连接
NSArray *arr = [hostStr componentsSeparatedByString:@":"];
NSError *error = nil;
NSString *portStr = arr[1];
[activeSocket connectToHost:arr[0] onPort:portStr.integerValue error:&error];
}
#pragma mark ServerSocketDelegate
-(void)ServerSocket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{
//接受其他客户端发送的消息，并且显示
NSString *receiveStr = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
dispatch_sync(dispatch_get_main_queue(), ^{
NSString *resultStr = [NSString stringWithFormat:@"%@\n%@",self.receiveDataLabel.text,receiveStr] ;
self.receiveDataLabel.text = resultStr;
});
}
完整项目下载地址：
https://github.com/kinglchristina/ClientSocket.git
